<template>
	<view>
		<!-- 使用自定义组件 -->
		<my-search @click="gotoSaerch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧栏 -->
			 <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
	        <block v-for="(item, i) in cateList" :key="i">
	           <view :class="['scroll-left-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
	         </block>
	      </scroll-view>
		  <!-- 右侧栏 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" scroll-top="scrollTop">
			  <view class="cate-lv2" v-for="(item2, i2) in cateLeve" :key="i2">
			    <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
				 <!-- 动态渲染三级分类的列表数据 -->
				    <view class="cate-lv3-list">
				      <!-- 三级分类 Item 项 -->
				      <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
				        <!-- 图片 -->
				        <image :src="item3.cat_icon"></image>
				        <!-- 文本 -->
				        <text>{{item3.cat_name}}</text>
				      </view>
				    </view>
			  </view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				wh:0,//窗口可用高度
				cateList:[],//分类数据列表
				active:0,
				cateLeve:[],//右侧数据
				scrollTop:0,//滚动条数据
			};
		},
		onLoad(){
		const sysInfo=uni.getSystemInfoSync()
		this.wh=sysInfo.windowHeight
		this.getCateList()

		},
		methods:{
			async getCateList(){
				const {data:res}=await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status!==200) return uni.$showMsg()
				this.cateList=res.message
				//为二级分类赋值
				this.cateLeve=res.message[0].children
			},
			// 点击三级分类项跳转到商品列表页面
			gotoGoodsList(item3) {
			  uni.navigateTo({
			    url: '/subpkg/good_list/good_list?cid=' + item3.cat_id
			  })
			},
			activeChanged(i){
				this.active= i
				this.cateLeve = this.cateList[i].children
				this.scrollTop= this.scrollTop =0? 1 :0
			},
			gotoSaerch(){
			uni.navigateTo({
			       url: '/subpkg/search/search'
			     })
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display:flex;
	.left-scroll-view{
		width:120px
	}
	.scroll-left-item{
		background-color: #f7f7ff;
		line-height:60px;
		text-align:center;
		font-size:12px;
		&.active{
			background-color: #ffffff;
              position: relative;
			        // 渲染激活项左侧的红色指示边线
			        &::before {
			          content: ' ';
			          display: block;
			          width: 3px;
			          height: 30px;
			          background-color:#c00000;
			          position: absolute;
			          left: 0;
			          top: 50%;
			          transform: translateY(-50%);
			        }
		}
	}
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
